Total hip arthroplasty (THA) is one of the most commonly performed orthopedic procedures worldwide, with over 450,000 operations performed annually in the United States alone — a number projected to exceed 635,000 by 2030 as the population ages (Wolford et al., 2015). While the implant itself restores joint mechanics, functional outcomes depend heavily on the quality of the rehabilitation that follows. Research consistently shows that patients who complete a structured, progressive rehab program return to independent mobility 3–6 weeks faster than those without guided exercise protocols (Okoro et al., 2019).
This protocol covers the critical hip precautions, exercise progressions by phase, gait training milestones, and home support strategies for the full 6-month recovery window from immediate post-operative days through return to recreational activity.
Understanding Hip Replacement Surgery
Total hip arthroplasty replaces the damaged femoral head and acetabular socket with prosthetic components. The two main surgical approaches — posterior and anterior — have distinct implications for rehabilitation precautions and early exercise selection.
| Approach | Muscles Cut | Key Precautions | Average Hospital Stay |
|---|---|---|---|
| Posterior | Short external rotators (piriformis, obturators) | No hip flexion >90°, no internal rotation, no adduction past midline | 2–3 days |
| Anterior (AMIS) | None (muscle-sparing) | No excessive hip extension in early phase; fewer flexion restrictions | 1–2 days |
| Lateral (Hardinge) | Gluteus medius (partial) | Avoid active hip abduction for 6 weeks; Trendelenburg gait common | 2–3 days |
The femoral stem and acetabular cup are typically fixed via press-fit (cementless) or cement. Cementless fixation requires strict weight-bearing restrictions for 6 weeks while bone ingrowth occurs. Cemented fixation allows earlier full weight-bearing — an important distinction that affects Phase 1 and 2 exercise selection.
Hip Precautions: What to Avoid and Why
Violating hip precautions in the first 6–12 weeks post-surgery risks dislocation — a serious complication requiring emergency reduction or revision surgery. The specific precautions depend on surgical approach.
Posterior Approach Precautions (Most Common)
- No hip flexion beyond 90 degrees: Bending at the hip past 90° (e.g., tying shoelaces, picking up objects from the floor, low chairs) risks levering the femoral head posteriorly out of the acetabulum.
- No crossing legs (adduction past midline): Cross-legged sitting and sleeping with knees together places the femoral head at dislocation risk.
- No inward rotation of the operated leg: Turning toes inward tightens the posterior capsule repair, risking disruption before it heals.
Practical Daily Life Adaptations
- Raised toilet seat (5–10 cm) to maintain hip angle above 90° while seated
- Long-handled reacher for floor objects and sock donner for lower extremity dressing
- Firm chair with armrests; avoid low sofas or recliners that place hip in deep flexion
- Abduction pillow or wedge pillow between knees during sleep for the first 6 weeks
Patients with anterior approach typically have fewer flexion restrictions but must avoid forced hip extension (hyperextension) and extreme ranges while soft tissue heals around the anterior capsule repair.
Phase 1: Acute Hospital Phase (Days 1–4)
Modern enhanced recovery after surgery (ERAS) protocols typically begin rehabilitation on the day of or day after surgery. Early mobilization — even brief — dramatically reduces DVT risk, pulmonary complications, and length of hospital stay.
Day 1–2 Goals
- Sit upright at edge of bed with physiotherapist assistance, observing hip precautions
- Transfer to chair (hip raised to maintain <90° flexion angle)
- Begin ankle pumps and calf raises to drive venous return and reduce DVT risk — target 10 repetitions every hour while awake
- Initiate quadriceps sets and gluteal contractions (isometric) 3×20 reps, 2–3 times daily
Day 2–4 Goals
- Ambulation with appropriate assistive device (walker or elbow crutches) for 5–10 minutes, 3 times daily
- Heel slides in supine: slide heel toward buttocks maintaining hip precautions — do not flex beyond comfortable range
- Terminal knee extension: place rolled towel under knee, straighten knee fully and hold 3 seconds; 3×15 reps
- Hip abduction in supine: slide operated leg outward along bed surface, maintaining neutral rotation; 3×10 reps
Phase 2: Early Home Rehab (Weeks 1–6)
This phase builds on hospital gains, progressively expanding weight-bearing tolerance and hip range of motion within precautionary limits. Most patients transition from a walker to a single crutch or cane by week 4–6, and from a cane to unaided walking by week 6–8 depending on approach and fixation type.
Weeks 1–3 Exercise Focus
- Supine heel slides: 3 sets of 15 repetitions, twice daily. Keep knee tracking over second toe and avoid hip flexion past comfortable range.
- Standing hip abduction: Hold countertop; lift operated leg to side 20–30 cm maintaining neutral rotation. 3×10, progress to 3×15 by week 3.
- Standing hip extension: Lift operated leg backward 10–15 cm; keep trunk upright. This activates gluteus maximus without violating anterior precautions.
- Stair climbing (when cleared): Lead with non-operated leg going up; lead with operated leg going down ("up with the good, down with the bad").
Weeks 4–6 Additions
- Mini-squats (0–45°): Hold sturdy surface; perform partial squats staying above 90° hip flexion. 3×15 reps.
- Step-ups (low step, 10–15 cm): Lead with operated leg stepping up; control descent. Trains unilateral weight-bearing critical for gait normalization.
- Standing calf raises: Bilateral first, then progress to single-leg; improves ankle-hip chain coordination.
Phase 3: Strengthening Phase (Weeks 6–12)
At the 6-week mark, cementless fixation is typically osseointegrated sufficiently for progressive loading. Precautions are often lifted (confirm with surgeon), and rehabilitation shifts toward restoring strength, endurance, and neuromuscular control.
Key Strength Exercises
- Lateral band walks: Light resistance band around ankles; side-step 10 paces each direction. Directly targets gluteus medius — the primary hip abductor responsible for preventing Trendelenburg gait.
- Seated leg press (60–90° range): Begin at 30–40% body weight; progress 5–10% weekly as tolerated.
- Romanian deadlift (light weight, bilateral): Excellent posterior chain activation; keep spine neutral and avoid excessive hip flexion past 70–80°.
- Bridge progressions: Supine with knees bent; raise hips until body is straight. Begin bilateral, progress to single-leg bridge once bilateral version is pain-free and controlled.
Gait Training Priorities
Many THR patients develop compensatory gait patterns that persist beyond pain resolution. Address these specifically: Trendelenburg lurch (weak gluteus medius — lateral band work), reduced stride length on operated side (hip extension tightness — prone hip extension stretching), and forward trunk lean (hip flexor tightness — kneeling hip flexor stretch 3×30 seconds).
Phase 4: Return to Activity (Weeks 12–26)
The final phase prepares patients for the recreational and daily life demands specific to their goals — whether that means gardening, golf, hiking, or returning to a physically demanding occupation. The joint replacement itself is designed to last 15–25 years with appropriate use; proper rehabilitation protects that investment.
| Activity | Typical Return Timeline | Notes |
|---|---|---|
| Swimming (no breaststroke) | 6–8 weeks | Avoid frog kick until precautions lifted |
| Cycling (stationary) | 6–8 weeks | Adjust seat height for <90° hip flexion |
| Golf (walking) | 12–16 weeks | Rotational forces — clear with surgeon |
| Hiking (flat terrain) | 12–16 weeks | Use trekking poles initially |
| Dancing | 16–24 weeks | Avoid extreme hip rotation positions |
| Running/jogging | Generally not recommended long-term | High-impact; increased implant wear risk |
High-impact activities (running, jumping, contact sports) significantly increase polyethylene wear and risk of implant loosening over time. Most orthopedic surgeons recommend lifelong avoidance of running and court sports after THA to maximize implant longevity (Kuster, 2002).
Supporting Tissue Recovery at Home
Surgical soft tissue recovery extends well beyond the bone ingrowth timeline. The posterior capsule repair, muscles that were retracted or cut, and surrounding fascia all require 3–6 months for full remodeling. Supporting this process through home habits meaningfully impacts final functional outcomes.
Sleep Position
For the first 6–8 weeks, sleep on the back or non-operated side with a pillow between the knees. Sleeping on the operated side increases compressive load on the healing capsule and risks rolling into adduction during deep sleep.
Scar Tissue Management
Beginning at week 6–8 when the incision is fully healed, scar massage with vitamin E oil or a silicone gel sheet (10 minutes daily) may soften hypertrophic scar tissue and improve the mobility of the skin over the hip. Some patients report reduced hypersensitivity at the scar site after 4–6 weeks of consistent massage.
Swelling Management
Operated-side swelling, particularly in the thigh and knee, is common for 3–6 months. Elevation of the leg above heart level for 20–30 minutes after exercise sessions and cold application (15 minutes) to the thigh (not directly over the incision in early weeks) are first-line home strategies. Compression shorts may be used after the wound is fully healed and surgeon-approved.
Nutrition for Bone and Soft Tissue Recovery
Adequate protein intake (1.2–1.6g/kg/day) supports muscle mass maintenance during the recovery period. Calcium (1,000–1,200 mg/day) and vitamin D (800–2,000 IU/day) support bone health around the implant. Omega-3 fatty acids (2–3g EPA+DHA daily) may support a balanced inflammatory response during the healing process.
